// JavaScript Document
 window.setInterval(function(){
							 	$.get("${pageContext.request.contextPath}/communication/user/ajax.mvc",
									 {"timed": new Date().getTime()},
									 function (data)
									 {
										// $("#logs").append("[data: " + data + " ]<br/>");
										document.getElementById("msg").innerHTML="此用户名可用";

									 });
							 },3000);//3秒刷新一次